#cantain{
    width: 800px;
    margin: 0px auto;
}
#top{
    text-align: center;
    margin-bottom: 20px;
}

#tb th,td{
    width: 150px;
    text-align: center;
    border: solid 1px;
}
table{
    border-spacing: 0px;
}

th{
    height: 30px;
    background-color: antiquewhite;
}